Mechanism of Reaction between Lanthanum Manganite and Yttria‐Stabilized Zirconia

Taimatsu, Hitoshi; Wãda, Keiji; Kaneko, Hiroyuki; Yamamura, Hiroshi

doi:10.1111/j.1151-2916.1992.tb08193.x

Cited by 148 publications

(82 citation statements)

References 10 publications

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“…The perovskite-type strontium-doped lanthanum manganites have been studied as the most promising candidate material for the of SOFCs cathode [8][9][10][11][12] . With operating temperature up to 1000 °C in air or oxygen atmosphere, the cathode material has to fulfill the following requirements: high electron conductivity, thermal and chemical stability, compatibility with the solid electrolyte, sufficient porosity and good adherence at the surface of the electrolyte 13 .…”

Section: Cathode (Air Electrode)mentioning

confidence: 99%

Influence of the starting materials on performance of high temperature oxide fuel cells devices

et al. 2004

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High temperature solid oxide fuel cells (SOFCs) offer an environmentally friendly technology to convert gaseous fuels such as hydrogen, natural gas or gasified coal into electricity at high efficiencies. Besides the efficiency, higher than those obtained from the traditional energy conversion systems, a fuel cell provides many other advantages like reliability, modularity, fuel flexibility and very low levels of NO x and SO x emissions. The high operating temperature (950-1000 °C) used by the current generation of the solid oxide fuel cells imposes severe constraints on materials selection in order to improve the lifetime of the cell. Besides the good electrical, electrochemical, mechanical and thermal properties, the individual cell components must be stable under the fuel cell operating atmospheres. Each material has to perform not only in its own right but also in conjunction with other system components. For this reason, each cell component must fulfill several different criteria. This paper reviews the materials and the methods used to fabricate the different cell components, such as the cathode, the electrolyte, the anode and the interconnect. Some remarkable results, obtained at IPEN (Nuclear Energy Research Institute) in São Paulo, have been presented.

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Section: Cathode (Air Electrode)mentioning

confidence: 99%

Influence of the starting materials on performance of high temperature oxide fuel cells devices

et al. 2004

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“…Several research groups have mostly used La x Sr 1-x MnO 3 perovskite-type oxide as the cathode material due to its stability at high temperatures and thermal expansion coefficient compatibility with yttria-stabilized-zirconia (YSZ) electrolyte (2)(3)(4). Although, La x Sr 1-x MnO 3 itself has a relatively good thermochemical stability at higher than approximately 1000 o C, reactivity of these perovskite-type oxides with YSZ at high temperatures forms the La 2 Zr 2 O 7 phase which has high electrical resistance and reduces the potential of SOFC (2,5). Doping LaNiO 3 with alternate elements has been studied and used as cathode material for SOFC (6,7).…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Stability and Polarization Resistance of La(Ni0.6Fe0.4)O3 Cathode

et al. 2007

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Polarization resistance of LaNi 0.6 Fe 0.4 O 3 (LNF) cathode has been investigated in relation to its electrical conductivity and thermochemical stability. Electrochemical properties of a solid oxide fuel cell using LNF as the cathode were compared to those using La 0.8 Sr 0.2 MnO 3 (LSM). Temperature dependence of the cathodic polarization resistance is discussed in terms of its thermochemical stability. The electrical conductivity of bulk LNF sample was measured with the four-probe DC method at different oxygen partial pressures. Phase identification for the LNF powder samples treated at 900 o C in the atmosphere of oxygen and argon was studied with time dependency of heat treatment by X-ray diffraction analysis. Although the rhombohedral crystal structure of the starting phase was maintained, the electrical conductivity of LNF sensitively changed with the partial pressure of oxygen.

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“…Nevertheless, they present problems due to lanthanum reaction at high temperatures with YSZ electrolytes (4)(5)(6) forming secondary phases such as La 2 Zr 2 O 7 . Furthermore, alkaline earth cations employed can also react with zirconia or with ceria based electrolytes, forming perovskite-type zirconates (SrZrO 3 ) and Ba, Sr cerates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Compatibilidad química y termomecánica entre manganitas de neodimio y electrolitos basados en ceria

Gil¹,

Tartaj²,

Moure³

2008

Bol. Soc. Esp. Ceram. Vidr.

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The goal of this work was to study the thermal expansion behaviour and to establish the phase relations between NdMe 0.5 Mn 0.5 O 3 (Me=Ni, Co) solid solutions as cathodes and two electrolytes based on Ce 0.9 Gd 0.1 O 1.95 . Doping of electrolyte with 1.0 wt% Bi 2 O 3 was employed in order to improve the densification process. The cathode-electrolyte pairs were obtained by isostatic pressing of constituent powders and posterior sintering using the temperature ranges between 1350-1400 ºC for 2 h. The sintering conditions were optimized to obtain highly densificated electrolytes and well-developed cathode-electrolyte interfaces. Scanning electron microscopy observation with EDAX analysis was performed in cathode-electrolyte interfacial regions in order to characterize the obtained microstructures and to determine possible cation diffusions from the cathode into the electrolyte. It is found that the nickel doped manganite, NdNi 0.5 Mn 0.5 O 3 , is chemically and thermo-mechanically compatible with both electrolytes without formation of new phases up to 1400ºC even during long time of treatments.Keywords: CeO 2 -Gd 2 O 3 , manganites, thermal compatibility, chemical compatibility. Compatibilidad química y termomecánica entre manganitas de neodimio y electrolitos basados en ceriaEl propósito del presente trabajo es establecer las relaciones de fase entre soluciones sólidas NdMe 0.5 Mn 0.5 O 3 (Me=Ni, Co) y electrolitos Ce 0.9 Gd 0.1 O 1.95 para su uso como cátodos y electrolitos SOFC, respectivamente. El electrolito fue en ocasiones dopado con 1.0 wt% Bi 2 O 3 con el objeto de mejorar su densificación. Así mismo se estudia el comportamiento termomecánico de dichos materiales. Los pares cátodo-electrolito fueron obtenidos a partir de polvos prensados isostáticamente y posteriormente sinterizados utilizando unos rangos de temperatura entre 1350 y 1400ºC durante 2h. Las condiciones de sinterización fueron optimizadas para obtener unos electrolitos altamente densificados y unas interfaces cátodo-electrolito bien definidas. La caracterización microestructural de las regiones interfaciales fue llevada a cabo mediante microscopía electrónica de barrido, además se realizaron análisis EDAX para determinar posibles fenómenos de difusión catiónica desde o hacia el catódo. Se puede concluir que la manganita dopada con níquel, NdNi 0.5 Mn 0.5 O 3 , es compatible química y termomecánicamente con los electrolitos basados en ceria, sin formación de nuevas fases incluso después de largos tiempos de tratamiento a 1400ºC.

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Mechanism of Reaction between Lanthanum Manganite and Yttria‐Stabilized Zirconia

Cited by 148 publications

References 10 publications

Influence of the starting materials on performance of high temperature oxide fuel cells devices

Influence of the starting materials on performance of high temperature oxide fuel cells devices

Thermochemical Stability and Polarization Resistance of La(Ni0.6Fe0.4)O3 Cathode

Compatibilidad química y termomecánica entre manganitas de neodimio y electrolitos basados en ceria

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